<template>
  <view>
    <!-- 使用自定义的组件 -->
    <my-search :bgcolor="'#c00000'" :radius="18" @myClick="gotoSearch"></my-search>
    
    <!-- 左侧滑动区域 -->
    <view class="scroll-view-container">
      <scroll-view scroll-y="true" :style="{height: wh + 'px'}" class="left-scroll-view">
        <block v-for="(item, i) in cateList" :key="i">
          <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChange(i)">{{item.cat_name}} </view>
        </block>
      </scroll-view>
      <!-- 右侧滑动区域 -->
      <scroll-view scroll-y="true" :style="{height: wh + 'px'}">
          <view v-for="(item2, i2) in cateLevel2" :key="i2">
            <!-- 二级分类的标题 -->
            <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
            <!-- 当前二级分类下的三级分类列表 -->
            <view class="cate-lv3-list" :scroll-top="scrollTop">
              <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
                <image :src="item3.cat_icon.replace('dev', 'web')" mode=""></image>
                <text>{{item3.cat_name}}</text>
              </view>
            </view>
          </view>
      </scroll-view>
    </view>
  </view>
</template>

<script>
  // 导入设置tabbar 购物车徽标的mixin
  import badgeMixin from '@/mixins/tabbar-badge.js'
  export default {
    mixins: [badgeMixin],
    name: 'myCate',
    data() {
      return {
        wh: 0,
        cateList: [],
        active: 0,
        // 二级分类的列表.
        cateLevel2: [],
        scrollTop: 0
      }
    },
    onLoad() {
      const sysInfo = uni.getSystemInfoSync()
      // console.log(sysInfo.screenHeight)
      this.wh = sysInfo.screenHeight - 50
      
      this.getCateList()
    },
    methods: {
      // 获取分类列表
      async getCateList() {
       const { data: res } = await uni.$http.get('/api/public/v1/categories')
       // console.log(res)
       if(res.meta.status !== 200) {
         return uni.$showMessage()
        }
        this.cateList = res.message
        this.cateLevel2 = res.message[0].children
      },
      activeChange(i) {
        this.active = i
        
        // 重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      // 跳转到商品列表页面
      gotoGoodsList(item3) {
        uni.navigateTo({ url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id })
      },
      gotoSearch() {
        console.log('ok')
        uni.navigateTo({ url: '/subpkg/search/search' })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container {
  display: flex;
  
  .left-scroll-view {
    width: 120px;
    
    .left-scroll-view-item {
      background-color: #F7F7F7;
      line-height: 60px;
      text-align: center;
      font-size: 12px;
      
      &.active {
        background-color: #ffffff;
        position: relative;
        
        &::before {
          position: absolute;
          content: '';
          display: block;
          width: 3px;
          height: 30px;
          background-color: #c00000;
          top: 50%;
          left: 0;
          transform: translateY(-50%);
        }
      }
    }
    
  }
  
  .cate-lv2-title {
    font-size: 15px;
    font-weight: 800;
    text-align: center;
    padding: 15px, 0;
  }
  
  .cate-lv3-list {
    display: flex;
    flex-wrap: wrap;
    margin-top: 10px;
    
    .cate-lv3-item {
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;
      
      image {
        width: 60px;
        height: 60px;
      }
      
      text {
        font-size: 12px
      }
    }
  }
}
</style>
